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Author
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Topic: Speedo gear
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JT
Gearhead Posts: 200
From: Pearland, Texas, USA
Registered: Oct 2000
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posted 05-04-2001 04:41 AM
  
Okay, I have another question. Does anyone know how to determine what size speedometer cable gear I need to correct my speedometer? I switched from 2.79 gears in my 8" to 3.25. I have a C-4 and P205/70R14's all the way round. My Speedo is way off. When it shows 70, I'm actually doing about 55. I figure there must be some way to calculate which speedo cable gear I need, other than trial and error. ------------------
JT
'68 Coupe w/351W
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 05-04-2001 05:14 AM
you need slow down the speedo. you likely have a 16 tooth speedo gear and you need and 18 tooth gear. i had the same problem with my grand marquis.
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Scott302
Journeyman Posts: 30
From: Livonia, MI, USA
Registered: Mar 2001
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posted 05-04-2001 07:19 AM
In our catalog in the speedometer section there is a formula to calculate the number of driven gear teeth you need for you particular application.
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JT
Gearhead Posts: 200
From: Pearland, Texas, USA
Registered: Oct 2000
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posted 05-04-2001 12:44 PM
Thanks Scott. I never noticed that in my NPD catalog. Now I just have to figure out how many teeth I have on the drive gear inside the tranny.
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 05-05-2001 04:01 AM
since you have a C4 i believe you have 7 teeth.
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mellowyellow
Gearhead Posts: 6805
From: So. Fl.
Registered: Aug 2000
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posted 05-05-2001 07:30 AM
I think NPD has the best selection of speedo gears. I had that trouble with my 65 and I tried 3 gears. By a stroke of luck, I met a Fl Highway Patrol officer in a gas station. He clocked me at speeds up to 55 and I finally knew I had the right gear! And no ticket!!
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JT
Gearhead Posts: 200
From: Pearland, Texas, USA
Registered: Oct 2000
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posted 05-05-2001 08:15 PM
From what I have seen NPD does have the best selection and prices. I think I'll get out my calculator and figure out which one to order. Thanks for all the advice.
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